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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Rustem V. Rafikov
* @version $Revision: 1.3 $
*/
package org.apache.harmony.x.imageio.plugins.jpeg;
import java.io.IOException;
import java.util.Locale;
import javax.imageio.ImageReader;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.spi.ServiceRegistry;
import javax.imageio.stream.ImageInputStream;
public class JPEGImageReaderSpi extends ImageReaderSpi {
public JPEGImageReaderSpi() {
super(JPEGSpiConsts.vendorName, JPEGSpiConsts.version,
JPEGSpiConsts.names, JPEGSpiConsts.suffixes,
JPEGSpiConsts.MIMETypes, JPEGSpiConsts.readerClassName,
STANDARD_INPUT_TYPE, JPEGSpiConsts.writerSpiNames,
JPEGSpiConsts.supportsStandardStreamMetadataFormat,
JPEGSpiConsts.nativeStreamMetadataFormatName,
JPEGSpiConsts.nativeStreamMetadataFormatClassName,
JPEGSpiConsts.extraStreamMetadataFormatNames,
JPEGSpiConsts.extraStreamMetadataFormatClassNames,
JPEGSpiConsts.supportsStandardImageMetadataFormat,
JPEGSpiConsts.nativeImageMetadataFormatName,
JPEGSpiConsts.nativeImageMetadataFormatClassName,
JPEGSpiConsts.extraImageMetadataFormatNames,
JPEGSpiConsts.extraImageMetadataFormatClassNames);
}
@Override
public boolean canDecodeInput(Object source) throws IOException {
ImageInputStream markable = (ImageInputStream) source;
try {
markable.mark();
byte[] signature = new byte[3];
markable.seek(0);
markable.read(signature, 0, 3);
markable.reset();
if ((signature[0] & 0xFF) == 0xFF &&
(signature[1] & 0xFF) == JPEGConsts.SOI &&
(signature[2] & 0xFF) == 0xFF) { // JPEG
return true;
}
} catch (IOException e) {
e.printStackTrace();
}
return false;
}
@Override
public ImageReader createReaderInstance(Object extension) throws IOException {
return new JPEGImageReader(this);
}
@Override
public String getDescription(Locale locale) {
return "DRL JPEG decoder";
}
@Override
public void onRegistration(ServiceRegistry registry, Class<?> category) {
// super.onRegistration(registry, category);
}
}
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